Oil-in-water emulsion cosmetic

ABSTRACT

An oil-in-water type emulsified cosmetic and a method of making can be prepared in a system not containing a silicone and is surprisingly produced without a wet-type dispersion apparatus by using a specific combination of the oil component constituting the oily phase and a hydrophobizing agent for a hydrophobized powder. The composition includes an aqueous phase; an oily phase dispersed in the aqueous phase; and a powder dispersed in the oily phase. The oily phase comprises a volatile hydrocarbon in oil in a combined amount of 40% by mass or more with respect to the total oil content. The powder has a surface hydrophobized by treatment with a metallic soap consisting of a higher fatty acid and a divalent metal, or by a composite treatment with a higher fatty acid and a divalent metal hydroxide.

RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No.15/206,639 filed on Jul. 11, 2016, which claims priority from U.S.Provisional Application No. 62/190,348 filed Jul. 9, 2015, the entirecontents of which are incorporated herein by reference.

FIELD OF THE INVENTION

The present invention relates to an oil-in-water type emulsifiedcosmetic, wherein a powder is evenly dispersed in an internal oilyphase. More specifically, the invention relates to an oil-in-water typeemulsified cosmetic that is easily produced while also excelling instability and dispersibility of the powder.

BACKGROUND

Oil-in-water type emulsified cosmetics containing titanium dioxide andzinc oxide are known. In particular, oil-in-water type emulsifiedcosmetics, wherein a hydrophobized powder is dispersed in an oily phase,have a watery and refreshing feeling of use, and also have excellentproperties such as makeup durability after application.

In emulsion systems having a powder dispersed in an oily phase, there isa problem in how to obtain stability and uniform dispersibility of thepowder. Conventionally, there is a requirement to produce the emulsionby mechanically dispersing the hydrophobized powder in the oily phaseusing a powerful wet-type dispersion apparatus such as a bead mill or aball mill.

With the above-described production method, there have been attempts toimprove the emulsion stability and dispersibility of the powder byblending in specific dispersants or emulsifying agents (Patent Document1), or thickening the external phase (aqueous phase) (Patent Document2), and unfortunately these have yielded only a certain degree ofeffects and are not satisfactory.

On the other hand, while conventional oil-in-water type emulsifiedcosmetics have a powder dispersed in an oily phase usually contain asilicone oil as an oily phase component, recent trends towards a morenaturally-oriented outlook have led to consumers desiring cosmetics notcontaining silicone oils (non-silicone cosmetics). However, it isclearly not known that there are examples of production of oil-in-watertype emulsified cosmetics having a powder dispersed in an oily phase ina system not containing a silicone oil.

RELATED ART

[Patent Document 1] JP 5228139 B

[Patent Document 2] JP 5053887 B

BRIEF DESCRIPTION OF THE INVENTION

Reference will now be made in detail to embodiments of the invention. Itwill also be understood that other embodiments may be utilized withoutdeparting from the scope of the present invention, and that the detaileddescription is not to be taken in a limiting sense or otherwise noted asin the appended claims without requirements of the written descriptionbeing required thereto. It will also be recognized that the disclosedcompositions and processes may be understood as methods of preparationor methods of preparing the same without departing from the scope andspirit of the present invention and that various operations insimplified form may be described as multiple discrete operations inturn, or in a manner that may be helpful in understanding embodiments ofthe present invention; however, the order of description should not beconstrued to imply that these operations are order dependent.

Problems to be Solved by the Invention

The present invention was made in view of the aforementionedcircumstances, and addresses the problem of providing an oil-in-watertype emulsified cosmetic that can be prepared even in a system notcontaining a silicone and that can be easily produced without using apowerful wet-type dispersion apparatus such as a bead mill.

Means for Solving the Problems

As a result of performing diligent research, the present inventorsdiscovered that the aforementioned problems could be solved by using aspecific combination of the oil component constituting the oily phaseand the hydrophobizing agent for the hydrophobized powder, therebyachieving the present invention.

In other words, the present invention relates to an oil-in-water typeemulsified cosmetic composition comprising an aqueous phase; an oilyphase dispersed in the aqueous phase; and a powder dispersed in the oilyphase; wherein the oily phase comprises (a) volatile hydrocarbon oil and(b) non-volatile hydrocarbon oil in a combined amount of 40% by mass ormore with respect to the total oil content, wherein the blending ratioof (b) non-volatile hydrocarbon oil to (a) volatile hydrocarbon oil,[(b)/(a)], is within a range of 0 to 2.5, and wherein the powdercomprises a powder having a surface hydrophobized by a treatment with ametallic soap consisting of a higher fatty acid and a divalent metal ora composite treatment with a higher fatty acid and a divalent metalhydroxide.

Effects of the Invention

The oil-in-water type emulsified cosmetic of the present invention iscapable of evenly and stably dispersing a hydrophobized powder in anoily phase under mild conditions using a homo mixer or the like, and theoil-in-water type emulsified cosmetic obtained by emulsifying theresulting oily phase in an aqueous phase excels in stability andprovides a refreshing sensation of use. Additionally, it can be preparedin a system not containing a silicone.

DETAILED DESCRIPTION OF THE INVENTION Modes for Carrying Out theInvention

The cosmetic according to the present invention is an oil-in-water typeemulsified cosmetic wherein an internal oily phase is dispersed in anexternal aqueous phase, and a powder is dispersed in the oily phase.

The oily phase in the oil-in-water type emulsified cosmetic of thepresent invention comprises (a) volatile hydrocarbon oil and (b)non-volatile hydrocarbon oil, such that the content ratio [(b)/(a)]between the (a) volatile hydrocarbon oil and the (b) non-volatilehydrocarbon oil is in the range of 0 to 2.5. In other words, thecosmetic of the present invention includes modes wherein (b)non-volatile hydrocarbon oil is not contained in the oily phase, whileon the other hand, when containing (b) non-volatile hydrocarbon oil, itscontent ratio [(b)/(a)] with respect to (a) volatile hydrocarbon oilshould be 2.5 or lower, preferably 2.0 or lower, more preferably 1.5 orlower, and even more preferably 1.0 or lower.

The (a) volatile hydrocarbon oil in the present invention refers to ahydrocarbon oil having a boiling point lower than 300° C. at 1 atm,specific examples of which include light isoparaffins, isododecane andisohexadecane.

The (b) non-volatile hydrocarbon oil in the present invention refers toa hydrocarbon oil having a boiling point of 300° C. or higher at 1 atm,examples of which include squalane, hydrogenated polydecene and vaselineVaseline™ (petroleum jelly).

In the cosmetic of the present invention, the combined amount of the (a)volatile hydrocarbon oil and the (b) non-volatile hydrocarbon oil mustbe at least 40 mass % with respect to the total oil content. Thecombined amount of the (a) volatile hydrocarbon oil and the (b)non-volatile hydrocarbon oil may, for example, be at least 50 mass %, atleast 0 mass %, at least 70 mass %, at least 80 mass %, or at least 85mass %, and the upper limit is not particularly limited, but may be atmost 100 mass %, at most 95 mass % or at most 90 mass %.

The oily phase in the cosmetic of the present invention may containarbitrary oil components other than the (a) volatile hydrocarbon oil andthe (b) non-volatile hydrocarbon oil, such as oils/fats, waxes, higherfatty acids, higher alcohols, ester oils or the like, within a range notcompromising the effects of the present invention.

Examples of the arbitrary oil component include isopropyl myristate,octyldodecyl myristate, isopropyl palmitate, butyl stearate, hexyllaurate, myristyl myristate, decyl oleate, hexyldecyl dimethyloctanote,cetyl lactate, myristyl lactate, lanolin acetate, isocetyl stearate,isocetyl isostearate, cholesteryl 12-hydroxystearate, ethylene glycoldi-2-ethylhexonate, dipentaerythritol fatty acid ester, N-alkylglycolmonoisostearate, neopentyl glycol dicaprate, diisostearyl malate,glycerin di-2-heptylundecanoate, trimethylolpropanetri-2-ethylhexanoate, pentaerythritol tetra-2-ethylhexanoate, glycerintri-2-ethylhexanoate, trimethylolpropane triisostearate, cetyl2-ethythexanoate, 2-ethylhexyl palmitate, glycerin trimyristate,glyceryl tri(caprylate/caprate), triethylhexanoin, cetyl ethylhexanoate,polyglyceryl-2 triisostearate, dipentaerythrityl hexahydroxystearate,pentaerythrityl tetra(behenate/benzoatekthylhexanoate), PPG-3dipivalate, dipentaerythrityl tripolyhydroxystearate, pentarythrityltetra(ethylhexanoate/benzoate), macadamia nut oil polygylceryl-6 estersbehenate, (phytoster/behenyl) dimer dilinoleate, lanolin, diethylhexylsuccinate, octyldodecyl lanolin fatty acid, isostearyl palmitate,diheptylundecyl adipate, isocetyl myristate, dihexyldecyl adipate,diisopropyl sebacate, pentaerythrityl tetraethylhexanoate,tri-2-heptylundecanoic acid glyceride, castor oil fatty acid methylester, oleyl oleate, cetostearyl alcohol, acetoglyceride,2-heptylundecyl palmitate, diisobutyl adipate, 2-octyldodecylN-lauroyl-L-glutamate, di-2-heptyundecyl adipate, ethyl laurate,di-2-ethylhexyl sebacate, 2-hexyldecyl myristate, 2-hexyldecylpalmitate, 2-hexyldecyl adipate, diisopropyl sebacate, 2-ethylhexylsuccinate, ethyl acetate, butyl acetate, amyl acetate, triethyl citrate,avocado oil, Japanese camellia oil, turtle oil, macadamia nut oil, cornoil, mink oil, olive oil, rapeseed oil, egg yolk oil, sesame seed oil,persic oil, wheat germ oil, sasanqua oil, castor oil, flaxseed oil,safflower oil, cottonseed oil, perilla oil, soybean oil, peanut oil, teaseed oil, torreya seed oil, rice bran oil, paulownia oil, jojoba oil,germ oil, triglycerin, glycerin trioctanoate and glycerintriisopalmitate.

The amount of the oil component in the cosmetic of the present inventionis preferably 1 to 40 mass %, more preferably 5% to 30% with respect tothe total amount of the cosmetic.

The cosmetic of the present invention essentially contains (a) volatilehydrocarbon oil as the oil component, and optionally contains (b)non-volatile hydrocarbon oil, these hydrocarbon oils occupying asignificant portion of the oil component. Additionally, the powder inthe oily phase is evenly and conveniently dispersed by performing thebelow-described specific treatments as the surface treatment of thepowder to be dispersed. Therefore, there is no need to add a volatilesilicone oil for the purpose of lightening the sensation of use as inconventional cosmetics. Therefore, the cosmetic of the present inventioncan be formulated as a so-called non-silicone cosmetic that does notcontain a silicone oil.

In the cosmetic of the present invention, the powder is dispersed in theoily phase. The powder is not particularly limited, and for example,includes titanium dioxide, iron oxide and zinc oxide subjected to aspecific hydrophobization treatment.

The specific hydrophobization treatment in the present invention refersto (1) a treatment with a metallic soap consisting of a higher fattyacid and a divalent metal, or (2) a composite treatment with a higherfatty acid and a divalent metal hydroxide. The higher fatty acid used inthis case is preferably a C8 to C24 (preferably C12 to C22) linear orbranched carboxylic acid. Specific examples include stearic acid andisostearic acid. As the divalent metal, magnesium is particularlypreferred.

The hydrophobization treatment method is not particularly limited, and awet method using a solvent, a vapor phase method, or a mechanochemicalmethod can be used.

The aforementioned powder subjected to a specific hydrophobizationtreatment is one or more selected from the group consisting ofpigment-grade titanium dioxide, fine particle titanium dioxide,pigment-grade zinc oxide, fine particle zinc oxide, talc, mica,sericite, kaolin, titanated mica, black iron oxide, yellow iron oxide,red iron oxide, ultramarine, Prussian blue, chromium oxide, chromiumhydroxide, silica and cerium oxide. In general, powders having a smallerparticle size are capable of more easily being dispersed, soconventionally, they were dispersed while mechanically pulverizing thepowders using a wet-type dispersion apparatus such as a bead mill.However, in the cosmetic of the present invention, even if theaforementioned titanium dioxide or zinc oxide that has been subjected toa specific surface treatment is a powder having a large size, such aspigment grade (average particle size about 0.2 to 0.4 μm), it can beeasily dispersed in an oily phase containing a hydrocarbon oil.Therefore, particularly in the case of including a powder havingrelatively large particle size, such as pigment-grade titanium dioxideor zinc oxide, the advantageous characteristics of the present inventioncan be achieved.

The powder contained in the cosmetic of the present invention may, inaddition to the aforementioned powder that has been subjected to aspecific hydrophobization treatment, include an optional powder that isnormally capable of being blended into cosmetics.

The aforementioned optional powder can be an untreated powder, or apowder that has been subjected to a surface hydrophobization treatment(other than the specified hydrophobization treatment).

While the average particle size of the powder is not particularlylimited, a powder having an average primary particle size of 0.001 μm to100 μm, preferably 0.001 μm to 10 μm should be used. However, theaverage particle size should preferably be adjusted so as to be smallerthan the emulsified particles in the oily phase. The powder content inthe cosmetic of the present invention can be appropriately chosen basedon the desired product form. For example, in the case of a base cosmeticor foundation, it should preferably be 8 to 60 mass %, and in the caseof a sunscreen cosmetic, it should preferably be 10 to 35 mass %.

The aqueous phase in the oil-in-water type emulsified cosmetic of thepresent invention should preferably contain a thickener. By including athickener, the stability of the emulsion is further improved.

The thickener may be of one or more types selected from the groupconsisting of natural or synthetic thickeners that can be contained incosmetics. Specific examples include succinoglycan, xanthan gum,carrageenan, gellan gum, starch, hydroxyalkylcellulose, pullulan,carbomer, (Na/Mg) silicate, bentonite, acrylamide copolymer, sodiumaeryloyl dimethyl taurine/hydroxyethyl acrylate copolymer, agar,polyurethane, and hydrophobic polyether polyurethane. Among these,naturally occurring thickeners such as agar, sugars or derivativesthereof are preferable used. Additionally, a microgel such as thatdescribed in JP 2001-342451 A, a published document, the entire contentsof which are incorporated herein by reference, is also preferable.

The thickener content in the cosmetic of the present invention shouldpreferably be 0.1 to 3 mass % with respect to the total amount of thecosmetic. If the thickener content is too low, the improvement instability may not be sufficient, and if the content is too high, thesensation of use may be worsened due to clumping.

Furthermore, the aqueous phase preferably contains one or moreemulsifying agents selected from the group consisting ofcarboxymethylcellulose, hydroxyethylcellulose, hydroxymethylcellulose,hydroxypropylcellulose and gelatin.

Additionally, components that are normally contained in cosmetics, forexample, UV absorbing agents, humectants, fragrances, surfactants,various pharmaceutically effective components, preservatives andantioxidants can be added in accordance with need, within a range notcompromising the effects of the present invention.

Unlike with conventional production methods, the cosmetic of the presentinvention can be conveniently produced under mild conditions. Forexample, it can be produced by dispersing the powder among the oilyphase components by means of a homo mixer or the like, adding theresulting oily phase to the aqueous phase using a homo mixer or thelike, stirring and emulsifying.

The oil-in-water type emulsified cosmetic of the present invention canbe provided as a base cosmetic, a foundation or a sunscreen cosmetic.

EXAMPLES

Here below, the present invention will be explained in further detailwith reference to examples, but the present invention is not limited bythese examples. Where not otherwise indicated, amounts are provided inmass %.

Oil-in-water type emulsified cosmetics (samples) were prepared with theformulations shown in the below-indicated Table 1. A sample of eachexample was evaluated according to the following categories. The resultsare shown together in Table 1.

(1) Emulsion Stability (Powder Dispersability)

Observations were made by an eye as to the presence or absence of colorirregularities caused by powder granules or powder agglomeration whenthe samples were applied to a black plate.

-   -   A+: absolutely no powder color irregularities caused by powder        granules or agglomeration when applied to a plate were observed    -   A−: slight powder color irregularities caused by extremely small        powder granules or agglomeration when applied to a plate were        observed    -   B: powder color irregularities caused by small powder granules        or agglomeration when applied to a plate were observed (not        presenting problems for use)    -   C: color irregularities caused by relatively large powder        granules or agglomeration when applied to a plate were observed

(2) Evenness of Finish

Female panelists (10 subjects) evaluated a sample of each example andcomparative example regarding the evenness of finish after application,on the basis of the following evaluation criteria.

(Evaluation)

-   -   A+: 8 or more replied that they felt an evenness of finish    -   A−: 6 or 7 replied that they felt an evenness of finish    -   B: 3 to 5 replied that they felt an evenness of finish    -   C: 2 replied that they felt an evenness of finish

(3) Smoothness of Spreading

Female panelists (10 subjects) evaluated a sample of each example andcomparative example regarding the smoothness of spreading duringapplication, on the basis of the following evaluation criteria.

(Evaluation)

-   -   A+: 8 or more replied that they felt a smoothness of spreading    -   A−: 6 or 7 replied that they felt a smoothness of spreading    -   B: 3 to 5 replied that they felt a smoothness of spreading    -   C: 2 replied that they felt a smoothness of spreading

TABLE 1 Comp. Comp. Ex. 1 Ex. 2 Ex. 3 Ex. 4 Ex. 1 Ex. 2 Ion exchangedwater balance balance balance balance balance balance Sorbitansesquiisostearate 0.5 0.5 0.5 0.5 0.5 0.5 Isostearic acid 1   1   1  1   1   — (b) Squalane — 6    9.575 13.15 19.15 6   (a) Isododecane19.15 13.15  9.575 6   — 13.15 Hydrophobized fine particle 7.5 7.5 7.57.5 7.5 — titanium dioxide (*1) Hydrophobized fine particle — — — — —7.5 titanium dioxide (*2) Hydrophobized pigment grade 3.2 3.2 3.2 3.23.2 — titanium dioxide (*3) Hydrophobized pigment grade — — — — — 3.2titanium dioxide (*4) Yellow iron oxide 1.1 1.1 1.1 1.1 1.1 1.1 Red ironoxide 0.2 0.2 0.2 0.2 0.2 0.2 Black iron oxide  0.04  0.04  0.04  0.04 0.04  0.04 Silica 2   2   2   2   2   2   Total 100    100    100   100    100    100    Content ratio [(b)/(a)] 0    0.46 1   2.2 ∞  0.46Emulsion stability A+ A+ A− B B C (powder dispersibility) Evenness offinish B A+ A− B C C Smoothness of spreading A+ A+ A+ A+ A+ B (*1)Composite treatment with isostearic acid and magnesium hydroxide (*2)Silicone treatment (*3) Magnesium isostearate treatment (*4) Siliconetreatment

As is clear from the results shown in Table 1, Examples 1 to 4 whereinthe blending ratio [(b)/(a)] of (b) non-volatile hydrocarbon oil to (a)volatile hydrocarbon oil contained in the oily phase is within the rangeof 0 to 2.5 and containing titanium dioxide subjected to the specificsurface hydrophobization treatment of the present application weresatisfactory in terms of all of the evaluated categories. In surprisingcontrast, Comparative Example 1 not containing volatile hydrocarbon oildid not have an even finish, and also in surprising contrast inComparative Example 2 containing titanium dioxide surface-treated withsilicone, the powder was not evenly dispersed and the finish wasinferior.

Having described at least one of the preferred embodiments of thepresent invention, it will be apparent to those skilled in the art thatthe invention is not limited to those precise embodiments, and thatvarious modifications and variations can be made in the presentlydisclosed system without departing from the scope or spirit of theinvention. Thus, it is intended that the present disclosure covermodifications and variations of this disclosure provided they comewithin the scope of the appended claims and their equivalents.

What is claimed is:
 1. An oil-in-water type emulsified cosmeticcomposition, comprising: (a) an aqueous phase; (b) 1 to 40% by mass ofan oily phase dispersed in the aqueous phase; and (c) a powder dispersedin the oily phase; wherein the oily phase comprises a volatilehydrocarbon oil and does not contain a non-volatile hydrocarbon oil; andwherein the powder has a surface hydrophobized by treatment with ametallic soap consisting of a higher fatty acid and a divalent metal, orby a composite treatment with a higher fatty acid and a divalent metalhydroxide.
 2. The cosmetic composition according to claim 1, furthercomprising: a thickener in the aqueous phase.
 3. The cosmeticcomposition according to claim 2, wherein: the thickener is one or moreselected from the group consisting of succinoglycan, xanthan gum,carrageenan, gellan gum, starch, hydroxyalkylcellulose, pullulan,carbomer, (Na/Mg) silicate, bentonite, acrylamide copolymer, sodiumacryloyl dimethyl taurine/hydroxyethyl acrylate copolymer, agar,polyurethane, and hydrophobic polyether polyurethane.
 4. The cosmeticcomposition according to claim 1, wherein: the powder is one or moreselected from the group consisting of titanium dioxide, iron oxide andzinc oxide.
 5. The cosmetic composition according to claim 4, wherein:the powder is a pigment grade powder.
 6. The cosmetic compositionaccording to claim 1, wherein: the higher fatty acid is a C8 to C24fatty acid, and the divalent metal is magnesium.
 7. The cosmeticcomposition according to claim 6, wherein: the higher fatty acid is aC12 to C22 linear or branched carboxylic acid.
 8. The cosmeticcomposition according to claim 1, wherein: the composition does notcomprise a silicone oil.
 9. The cosmetic composition according to claim5, wherein: the composition further comprises a microparticle powderselected from the group consisting of titanium dioxide microparticles,iron oxide microparticles and zinc oxide microparticles.
 10. Anoil-in-water type emulsified cosmetic composition, comprising: (a) anaqueous phase; (b) 10 to 40% by mass of an oily phase dispersed in theaqueous phase; and (c) a powder dispersed in the oily phase; wherein theoily phase does not contain a silicone oil, does not contain anon-volatile hydrocarbon oil, and comprises a volatile hydrocarbon oilin an amount of 40% by mass or more with respect to the total oilcontent; and wherein the powder has a surface hydrophobized by atreatment with a metallic soap consisting of a higher fatty acid and adivalent metal, or by a composite treatment with a higher fatty acid anda divalent metal hydroxide.
 11. The cosmetic composition, according toclaim 10, wherein: the powder comprises a pigment-grade powder selectedfrom the group consisting of titanium dioxide, iron oxide and zincoxide; and wherein the composition further comprises a microparticlepowder selected from the group consisting of titanium dioxidemicroparticles, iron oxide microparticles and zinc oxide microparticles.12. An oil-in-water type emulsified cosmetic composition, comprising:(a) an aqueous phase; (b) 1 to 40% by mass of an oily phase dispersed inthe aqueous phase; and (c) a powder dispersed in the oily phase; whereinthe oily phase does not contain a silicone oil, does not contain anon-volatile hydrocarbon oil, and comprises a volatile hydrocarbon oilin an amount of 40% by mass or more with respect to the total oilcontent; wherein the powder has a surface hydrophobized by a treatmentwith a metallic soap consisting of a higher fatty acid and a divalentmetal, or by a composite treatment with a higher fatty acid and adivalent metal hydroxide; wherein the powder comprises a pigment-gradepowder selected from the group consisting of titanium dioxide, ironoxide and zinc oxide; and wherein the composition further comprises amicroparticle powder selected from the group consisting of titaniumdioxide microparticles, iron oxide microparticles and zinc oxidemicroparticles.
 13. The cosmetic composition according to claim 1,wherein: the volatile hydrocarbon oil is selected from the groupconsisting of light isoparaffins, isododecane and isohexadecane.
 14. Thecosmetic composition according to claim 10, wherein: the volatilehydrocarbon oil is selected from the group consisting of lightisoparaffins, isododecane and isohexadecane.
 15. The cosmeticcomposition according to claim 12, wherein: the volatile hydrocarbon oilis selected from the group consisting of light isoparaffins, isododecaneand isohexadecane.